Metallic piston



M. KROSCHINSKY METALLIC PISTON April a, 1924. 1,489,767

Filed March 11, 1922 1o g" g Marlin Erma/liming Patented Apr. 8, 1924.

NHTED STATES PATENT oFFIcE.

MARTIN KROSCHINSKY, 0F BALTIMORE, MARYLAND, ASSIGNOR T0 MARKEB MANU- FACTURING COMPANY, OF BALTIMORE, MARYLAND, A CORPORATION OF MARY- LAND.

METALLIC PISTON.

Application filed March 11,1922.

To all whom it may concern:

Be it known that I, MARTIN Knosomn SKY, a citizen of the United States, residing in the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Metallic Pistons; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in metallic pistons for use in internal combustion or steam engines, pumps, or the like, in which it is desirable to use a metallic piston and piston packing, and to keep the surface of the cylinder and of the piston which are in contact well lubricated without a needless waste of oil.

My present invention is more especially intended to provide a special form of metallic piston, which will be more fully understood after reference to the accompanying drawings, in which like parts are indicated by similar reference symbols throughout the several views and in which Figure l is a sectional elevation through a portion of the cylinder and enclosing jacket, the piston and packing rings being shown in elevation; and

Figure 2 is a sectional elevation showing the piston detached from the rest of the apparatus, and with the packing rings removed.

A represents the cylinder which may be provided with a suitable jacket A for cooling or heating purposes as the case may be.

My invention does not comprise the cylinder, and any suitable form of cylinder may be used as desired.

B represents the piston which is preferably of the usually hollowed-out or bellshaped construction, with internally projecting bearings B for the pin D to which the piston rod C is connected in the usual way; but the interior of the piston may be of any desired or preferable hollow shape, and the piston rod may be connected theretoin any convenient way. My invention relates more particularly to the exterior of the piston.

Beginning with the top of the piston, Z) is the usual coned face, in rear of which are the annular grooves b and separated from each other by the annular rib 26 Serial No. 542,953.

The openings to receive the pin D extend out preferably to the outer edge of the piston, as shown at 6. Towards the rear, the piston is shown as provided with another groove 6 for the third packing ring.

The packing rings E, E and E may be of any suitable or preferred construction, preferably that shown in my co-pending application filed of even date herewith and entitled improvements in metallic piston packing rings.

Towards the rear, the piston is provided with two conical surfaces a and b forming between the same a pocket 6 to catch the lubricant which is scraped into said pocket from the inner walls of the cylinder by the scraping edge b. Each of the walls which form the pockets 6 extends downwardly and inwardly at an inclination, and the wall 11 projects beyond the outer terminus of the wall 6 The inner termini of the walls Z), 0 are slightly curved whereby the inner end of the pocket is rounded and arranged below the scraping edge 6 formed by the outer terminus of the wall 6 Any excess of lubricant that accumulates in this annular pocket passes through the port or holes 6 into the interior of the piston and falls down on the crank shaft'bearings, not shown. The lower face of the piston is tapered upwards and inwards, as at o leaving a scraping edge 6 which serves to scrape off any excess of lubricant adhering to the interior of the cylinder, and throws it down onto the crank shaft bearings as before described.

By the herein described construction a highly eliicient lubrication of the parts of the cylinden,v piston and piston rings in contact is secured, and at the same time the supply of oil or other lu bricant used is limited or controlled in such a way as to promote economy in the use of lubricant, and prevent charring of the oil in the cylinder.

I have shown three grooves for packing rings and three sets of metallic piston packing rings mounted in these grooves, which will steady the piston in its travel, and in alarge measure prevent the lateral vibra' tion of the same or slapping as it is called; but the number of grooves and corresponding sets of piston rings may be increased or decreased as desired, and yet come within the construction claimed.

at its bottom and provided intermediate its ends with a peripheral V-shaped pocket formed of an upper and a lower wall, each extending inwardly and downwardly at an inclination said lower wall projecting beyond the outer terminus of the upper wall and forming an annular scraping edge and 20 said body portion further formed with ports disposed at an angle with respect to the axis thereof and opening outwardly through said upper wall above the bottom thereof.

BIARTIN KROSCHINSKY. 

